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                        <div class="highlight"><pre><span class="cm">/**</span>
<span class="cm"> * Text utilities.</span>
<span class="cm"> *</span>
<span class="cm"> * @module text</span>
<span class="cm"> * @since 3.3.0</span>
<span class="cm"> */</span>

<span class="cm">/**</span>
<span class="cm"> * Provides a basic accent folding implementation that converts common accented</span>
<span class="cm"> * letters (like &quot;á&quot;) to their non-accented forms (like &quot;a&quot;).</span>
<span class="cm"> *</span>
<span class="cm"> * @module text</span>
<span class="cm"> * @submodule text-accentfold</span>
<span class="cm"> */</span>

<span class="cm">/**</span>
<span class="cm"> * &lt;p&gt;</span>
<span class="cm"> * Provides a basic accent folding implementation that converts common accented</span>
<span class="cm"> * letters (like &quot;á&quot;) to their non-accented forms (like &quot;a&quot;).</span>
<span class="cm"> * &lt;/p&gt;</span>
<span class="cm"> *</span>
<span class="cm"> * &lt;p&gt;</span>
<span class="cm"> * This implementation is not comprehensive, and should only be used as a last</span>
<span class="cm"> * resort when accent folding can&#39;t be done on the server. A comprehensive</span>
<span class="cm"> * accent folding implementation would require much more character data to be</span>
<span class="cm"> * sent to the browser, resulting in a significant performance penalty. This</span>
<span class="cm"> * implementation strives for a compromise between usefulness and performance.</span>
<span class="cm"> * &lt;/p&gt;</span>
<span class="cm"> *</span>
<span class="cm"> * &lt;p&gt;</span>
<span class="cm"> * Accent folding is a destructive operation that can&#39;t be reversed, and may</span>
<span class="cm"> * change or destroy the actual meaning of the text depending on the language.</span>
<span class="cm"> * It should not be used on strings that will later be displayed to a user,</span>
<span class="cm"> * unless this is done with the understanding that linguistic meaning may be</span>
<span class="cm"> * lost and that you may in fact confuse or insult the user by doing so.</span>
<span class="cm"> * &lt;/p&gt;</span>
<span class="cm"> *</span>
<span class="cm"> * &lt;p&gt;</span>
<span class="cm"> * When used for matching, accent folding is likely to produce erroneous matches</span>
<span class="cm"> * for languages in which characters with diacritics are considered different</span>
<span class="cm"> * from their base characters, or where correct folding would map to other</span>
<span class="cm"> * character sequences than just stripped characters. For example, in German</span>
<span class="cm"> * &quot;ü&quot; is a character that&#39;s clearly different from &quot;u&quot; and should match &quot;ue&quot;</span>
<span class="cm"> * instead. The word &quot;betrügen&quot; means &quot;to defraud&quot;, while &quot;betrugen&quot; is the past</span>
<span class="cm"> * tense of &quot;to behave&quot;. The name &quot;Müller&quot; is expected to match &quot;Mueller&quot;, but</span>
<span class="cm"> * not &quot;Muller&quot;. On the other hand, accent folding falls short for languages</span>
<span class="cm"> * where different base characters are expected to match. In Japanese, for</span>
<span class="cm"> * example, hiragana and katakana characters with the same pronunciation (&quot;あ&quot;</span>
<span class="cm"> * and &quot;ア&quot;) are commonly treated as equivalent for lookups, but accent folding</span>
<span class="cm"> * treats them as different.</span>
<span class="cm"> * &lt;/p&gt;</span>
<span class="cm"> *</span>
<span class="cm"> * @class Text.AccentFold</span>
<span class="cm"> * @static</span>
<span class="cm"> */</span>

<span class="kd">var</span> <span class="nx">YArray</span>   <span class="o">=</span> <span class="nx">Y</span><span class="p">.</span><span class="nb">Array</span><span class="p">,</span>
    <span class="nx">Text</span>     <span class="o">=</span> <span class="nx">Y</span><span class="p">.</span><span class="nx">Text</span><span class="p">,</span>
    <span class="nx">FoldData</span> <span class="o">=</span> <span class="nx">Text</span><span class="p">.</span><span class="nx">Data</span><span class="p">.</span><span class="nx">AccentFold</span><span class="p">,</span>

<span class="nx">AccentFold</span> <span class="o">=</span> <span class="p">{</span>
    <span class="c1">// -- Public Static Methods ------------------------------------------------</span>

    <span class="cm">/**</span>
<span class="cm">     * Returns &lt;code&gt;true&lt;/code&gt; if the specified string contains one or more</span>
<span class="cm">     * characters that can be folded, &lt;code&gt;false&lt;/code&gt; otherwise.</span>
<span class="cm">     *</span>
<span class="cm">     * @method canFold</span>
<span class="cm">     * @param {String} string String to test.</span>
<span class="cm">     * @return {Boolean}</span>
<span class="cm">     * @static</span>
<span class="cm">     */</span>
    <span class="nx">canFold</span><span class="o">:</span> <span class="kd">function</span> <span class="p">(</span><span class="nx">string</span><span class="p">)</span> <span class="p">{</span>
        <span class="kd">var</span> <span class="nx">letter</span><span class="p">;</span>

        <span class="k">for</span> <span class="p">(</span><span class="nx">letter</span> <span class="k">in</span> <span class="nx">FoldData</span><span class="p">)</span> <span class="p">{</span>
            <span class="k">if</span> <span class="p">(</span><span class="nx">FoldData</span><span class="p">.</span><span class="nx">hasOwnProperty</span><span class="p">(</span><span class="nx">letter</span><span class="p">)</span> <span class="o">&amp;&amp;</span>
                    <span class="nx">string</span><span class="p">.</span><span class="nx">search</span><span class="p">(</span><span class="nx">FoldData</span><span class="p">[</span><span class="nx">letter</span><span class="p">])</span> <span class="o">!==</span> <span class="o">-</span><span class="mi">1</span><span class="p">)</span> <span class="p">{</span>
                <span class="k">return</span> <span class="kc">true</span><span class="p">;</span>
            <span class="p">}</span>
        <span class="p">}</span>

        <span class="k">return</span> <span class="kc">false</span><span class="p">;</span>
    <span class="p">},</span>

    <span class="cm">/**</span>
<span class="cm">     * Compares the accent-folded versions of two strings and returns</span>
<span class="cm">     * &lt;code&gt;true&lt;/code&gt; if they&#39;re the same, &lt;code&gt;false&lt;/code&gt; otherwise. If</span>
<span class="cm">     * a custom comparison function is supplied, the accent-folded strings will</span>
<span class="cm">     * be passed to that function for comparison.</span>
<span class="cm">     *</span>
<span class="cm">     * @method compare</span>
<span class="cm">     * @param {String} a First string to compare.</span>
<span class="cm">     * @param {String} b Second string to compare.</span>
<span class="cm">     * @param {Function} func (optional) Custom comparison function. Should</span>
<span class="cm">     *   return a truthy or falsy value.</span>
<span class="cm">     * @return {Boolean} Results of the comparison.</span>
<span class="cm">     * @static</span>
<span class="cm">     */</span>
    <span class="nx">compare</span><span class="o">:</span> <span class="kd">function</span> <span class="p">(</span><span class="nx">a</span><span class="p">,</span> <span class="nx">b</span><span class="p">,</span> <span class="nx">func</span><span class="p">)</span> <span class="p">{</span>
        <span class="kd">var</span> <span class="nx">aFolded</span> <span class="o">=</span> <span class="nx">AccentFold</span><span class="p">.</span><span class="nx">fold</span><span class="p">(</span><span class="nx">a</span><span class="p">),</span>
            <span class="nx">bFolded</span> <span class="o">=</span> <span class="nx">AccentFold</span><span class="p">.</span><span class="nx">fold</span><span class="p">(</span><span class="nx">b</span><span class="p">);</span>

        <span class="k">return</span> <span class="nx">func</span> <span class="o">?</span> <span class="o">!!</span><span class="nx">func</span><span class="p">(</span><span class="nx">aFolded</span><span class="p">,</span> <span class="nx">bFolded</span><span class="p">)</span> <span class="o">:</span> <span class="nx">aFolded</span> <span class="o">===</span> <span class="nx">bFolded</span><span class="p">;</span>
    <span class="p">},</span>

    <span class="cm">/**</span>
<span class="cm">     * &lt;p&gt;</span>
<span class="cm">     * Returns a copy of &lt;em&gt;haystack&lt;/em&gt; containing only the strings for which</span>
<span class="cm">     * the supplied function returns &lt;code&gt;true&lt;/code&gt;.</span>
<span class="cm">     * &lt;/p&gt;</span>
<span class="cm">     *</span>
<span class="cm">     * &lt;p&gt;</span>
<span class="cm">     * While comparisons will be made using accent-folded strings, the returned</span>
<span class="cm">     * array of matches will contain the original strings that were passed in.</span>
<span class="cm">     * &lt;/p&gt;</span>
<span class="cm">     *</span>
<span class="cm">     * @method filter</span>
<span class="cm">     * @param {Array} haystack Array of strings to filter.</span>
<span class="cm">     * @param {Function} func Comparison function. Will receive an accent-folded</span>
<span class="cm">     *   haystack string as an argument, and should return a truthy or falsy</span>
<span class="cm">     *   value.</span>
<span class="cm">     * @return {Array} Filtered copy of &lt;em&gt;haystack&lt;/em&gt;.</span>
<span class="cm">     * @static</span>
<span class="cm">     */</span>
    <span class="nx">filter</span><span class="o">:</span> <span class="kd">function</span> <span class="p">(</span><span class="nx">haystack</span><span class="p">,</span> <span class="nx">func</span><span class="p">)</span> <span class="p">{</span>
        <span class="k">return</span> <span class="nx">YArray</span><span class="p">.</span><span class="nx">filter</span><span class="p">(</span><span class="nx">haystack</span><span class="p">,</span> <span class="kd">function</span> <span class="p">(</span><span class="nx">item</span><span class="p">)</span> <span class="p">{</span>
            <span class="k">return</span> <span class="nx">func</span><span class="p">(</span><span class="nx">AccentFold</span><span class="p">.</span><span class="nx">fold</span><span class="p">(</span><span class="nx">item</span><span class="p">));</span>
        <span class="p">});</span>
    <span class="p">},</span>

    <span class="cm">/**</span>
<span class="cm">     * Accent-folds the specified string or array of strings and returns a copy</span>
<span class="cm">     * in which common accented letters have been converted to their closest</span>
<span class="cm">     * non-accented, lowercase forms.</span>
<span class="cm">     *</span>
<span class="cm">     * @method fold</span>
<span class="cm">     * @param {String|Array} input String or array of strings to be folded.</span>
<span class="cm">     * @return {String|Array} Folded string or array of strings.</span>
<span class="cm">     * @static</span>
<span class="cm">     */</span>
    <span class="nx">fold</span><span class="o">:</span> <span class="kd">function</span> <span class="p">(</span><span class="nx">input</span><span class="p">)</span> <span class="p">{</span>
        <span class="k">if</span> <span class="p">(</span><span class="nx">Y</span><span class="p">.</span><span class="nx">Lang</span><span class="p">.</span><span class="nx">isArray</span><span class="p">(</span><span class="nx">input</span><span class="p">))</span> <span class="p">{</span>
            <span class="k">return</span> <span class="nx">YArray</span><span class="p">.</span><span class="nx">map</span><span class="p">(</span><span class="nx">input</span><span class="p">,</span> <span class="nx">AccentFold</span><span class="p">.</span><span class="nx">fold</span><span class="p">);</span>
        <span class="p">}</span>

        <span class="nx">input</span> <span class="o">=</span> <span class="nx">input</span><span class="p">.</span><span class="nx">toLowerCase</span><span class="p">();</span>

        <span class="nx">Y</span><span class="p">.</span><span class="nb">Object</span><span class="p">.</span><span class="nx">each</span><span class="p">(</span><span class="nx">FoldData</span><span class="p">,</span> <span class="kd">function</span> <span class="p">(</span><span class="nx">regex</span><span class="p">,</span> <span class="nx">letter</span><span class="p">)</span> <span class="p">{</span>
            <span class="nx">input</span> <span class="o">=</span> <span class="nx">input</span><span class="p">.</span><span class="nx">replace</span><span class="p">(</span><span class="nx">regex</span><span class="p">,</span> <span class="nx">letter</span><span class="p">);</span>
        <span class="p">});</span>

        <span class="k">return</span> <span class="nx">input</span><span class="p">;</span>
    <span class="p">}</span>
<span class="p">};</span>

<span class="nx">Text</span><span class="p">.</span><span class="nx">AccentFold</span> <span class="o">=</span> <span class="nx">AccentFold</span><span class="p">;</span>
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